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acid action alizarine aluminium angle aniline anthracene apparatus appear applied arrangement attached axis battery bridge cables canal carbon carbonic acid carried centre chemical coal coal-tar coil colour connected construction copper cylinder diameter direction distance effect electric electric telegraph engine flame force Fraunhofer lines gases glass Gramme machine gun-cotton gutta-percha heat hydraulic hydrogen impression inch instrument invention iron lamp length lever light liquid machine magnet matter mechanical metal miles motion movement nitric acid observed obtained operation ordinary oxide oxygen paper pass photographic piece piston placed plate position pressure prism produced quantity railway rays reader retina rock rollers screw ship spectrum steam steam engine steam hammer steel stereoscopic substance surface telegraph temperature thick tion toluidine tons torpedo tube tunnel turned vapour vertical vessel vibrations weight wheel wire wrought iron